OCZ DDR2 PC2-4200 Value Pro
 

What can I say, this is some serious RAM, you can find it online for less
than $100 for a 1GB kit. With some mild tweaking you got from some decent
priced PC 4200 value RAM to some REALLY decent priced PC5400. Every once
in a while a product comes along that gives you WAY more bang for the buck
than you expect, like the ti series NVIDIA cards, the JIUHB XP 1700 and
the ABIT NF7-s motherboard. You mention any of those products to an
enthusiast and it brings a smile to their faces.

http://www.viperlair.com/reviews/memory/ocz/DDR2/4200/